package com.example.lenovo.helloworld;

import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;


public class MainActivity extends Activity implements View.OnClickListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
//        replaceFragment(new FirstFragment());
        Button buttonToFirst = (Button)findViewById(R.id.btn_changeTo1);
        Button buttonToSecond = (Button) findViewById(R.id.btn_changeTo2);
        buttonToFirst.setOnClickListener(this);
        buttonToSecond.setOnClickListener(this);

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btn_changeTo1: {
                replaceFragment(new FirstFragment());
                break;
            }
            case R.id.btn_changeTo2: {
                replaceFragment(new SecondFragment());
                break;
            }
            default:
        }
    }
    public void replaceFragment(Fragment fragment) {
        FragmentManager fragmentManager = getFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.replace(R.id.layout,fragment);
        fragmentTransaction.commit();
    }
}
